Missotjei



(No Model.) Q

T. W. MAXEY.

ADDING MACHINE.

N0. 335,374. Patented Feb. 2, 1886.

INVENTOR wnmssns:

ATTORNEYS.

NITED STATES PATENT Fries.

THOMAS XV. MAXEY, OF NEVADA, MISSOURI.

ADUENG=MACHNE EPECIFICATION forming part of Letters Patent 17033537 2,dated February 2, 1886.

Application filed May Iii, 1885. Serial No. 165,281. (No model.)

.7 0 ctZZ w/wm it may concern.-

Be it known that I, Trronms W. hIAXEY, a citizen of the United States,residing at Ne vada, in the county of Vernon and State of Missouri, haveinvented certain new and useful Improvements in Adding-Illachines, ofwhich the following is a description.

This invention relates to that class of adding machines in which anumber of wheels are journaled to be revolved on a shaft and providedcircumferentially with figures to indicate the amount of an addition;and the object of the invention is to add mechanically the numbers inone or more columns of figures by moving levers representing the columnsas many times as there are units in each column.

To this end the invention consists in the construction and combinationof parts forming an adding-machine, hereinafter described and claimed,reference being had to the accompanying drawings, in which Figure l is aplan view of my invention. Fig. 2 is a transverse vertical section ofthe same at the line :0 a".

The frame of themachine consists of a floor, A, two side pieces, B,rigidly fixed thereto, and a cross-piece, C. secured at the top edges ofthe rear ends of the sides.

D is a shaft fixed in the sides parallel. with the bottom.

E represents a series of wheels j ourualed cl ose against one anotherupon the shaft. Each wheel is provided with figures on its circumferenceG, numbering from O to 9, the Obeing the right-hand figure in 10, 20,&c., and each wheel is provided with ten ratchet-teeth, F, equallyspaced around a portion of the wheel smaller than the figured portion G,the ratchetteeth and the figures exactly corresponding with each otherin a fixed relation. These teeth are engaged by spring-pawls H, mountedon finger-levers J, which are pivoted midway upon a shaft, K,which isfixed in the sides parallel with shaft D, one lever and pawl to eachwheel. The finger ends L of the levers are pressed upward by springsM,so that the pawl ends of the lovers rest normally on the bottom A. Thefinger ends L may be knobs of any form to suit the judgment or fancy,toserve as convenient projections upon which to place the operatorsfingers to use the machine.

In order that more room may be given for the operation of each knob,Imake one half of the levers a little shorter than the other half, thelong and short ones alternating on the shaft K. The extreme amountofmotion which it1s possible to give to each lever is just enough tomove the wheel which its pawl engages ust one tooth, or one-tenth partof a circle. The mot on of the levers is limited by their two endsstrlking upon the bottom A at each end ofthe sweep, the levers beingadjusted when the machine is made to accomplish this result. Thefingerknobs L are high enough to permit the finger of the operator topush each lever completely down to the bottom without comingin contactwith the adjacent levers. The knobs thus raised above the levers form anessential feature of my invention.

N is a spring-detent pivoted to the frame to engage the teeth F of thefirst or units wheel E,to prevent the latter from being drawn baclr bythe return motion of the pawl H. Each of the other wheels representingin the order of columns of figures tens, hundreds, thousands, &c., isprovided with two circles of ratchetteeth, F and 0, one upon each faceofthe wheel, the circle of teeth F being smaller in diameter than thecircle 0.

P represents the carrier-hook placed be tween the faces of the wheels E,to engage the teeth 0, and provided with a shank, eX- tending through aslot provided for it in the cross-piece 0. By this means the hook isguided to move in a tangent direction relative to the wheel.

R is a pin projecting radially from each wheel, and S is a pinprojecting from the slde of the carrier across the path of pin R, to beengaged thereby at each revolution. Theprojecting length of the pin Bisadjusted to move the carrier far enough to carry the tens-wheel onetooth by a movement of the units-wheel one tooth, Then the pin R escapesfrom the pin S. The location of the pin R on the circumference of theunits-wheel is such that it performs the office of carrying at the timewhen the 0 figure on the units-wheel arrives at the reading-point. Thisreading-point may be a line established arbitrarily parallel with theshaft at any point in the circumference of the wheels. Suppose it to bein front of the carrier-pins S. In preparing to use the machine, bringthe 0 figure of each wheel to the reading-line. Suppose we have a seriesof numbers to add in which 5, 3, 6, and 7 stand in the units-column. Weproceed to operatethe first finger-lever five times, three times, sixtimes, and seven-times. At the end we find 1 in the units-column and 2in the tens, showing twenty-one to be the sum of the addition. At thetenth movement the carrier was operated and lappeared in thetens-column, and at the twentieth movement 2 appeared in the tenscolumn.Now, to this we may proceed to add the tens of the column to be added byoperating the tens-lever, and so on until all the figures are added,when the whole sum will appear before the eye at the reading-line. Theoperator may, if he chooses, add three or four columns at a singleoperation by operating each lever to correspond with the figure set inthe column indicated thereby, then, at any point where he may stopadding, the readingline will show the amount thus far added up.

a a are springs pressing the carrier-hooks into engagement with theirrespective ratchetwheels.

i b b are springs which quickly return each carrier after it has doneaservice.

0 represents a stop pin or screw in the carrier-shank serving as ashoulder to abut against the cross-piece to stopthe carrier at a fixedpoint at each return movement.

d is a spring acting against the end of the wheels to hold them byfriction from being thrown too far in operation. The first wheel may beexactly like all the rest; but the carrier-teeth O on it would beuseless.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination of an adding-machine frame having sides and across-piece with holes in it, a shaft fixed therein, a series of wheelsjournaled on the shaft, each wheel divided on its circumference into tenequal spaces and marked with figures, and provided witha tentoothedratchet-wheel on each face, a series of finger -levers each pivotedmidway in the frame opposite to one of the wheels, a spring forreturning each finger-lever, a spring-pawl on each lever fitted toengage one of the two sets of ratchet-teeth on the corresponding wheel,a carrying-hook hung between each two adjacent wheels to engage theother of the two sets of ratchet-teeth referred to, and provided with va shank fitted to slide in one of the said holes in the cross-piece ofthe frame, a radial pin projecting from the rim of each wheel, a pinprojecting from the side of the carrier-hook in the path of said radialpin, a spring to force the carrier-hook into engagement, and a spring toreturn the carrier-hook, substantially as shown and described.

2. The combination, with two wheels journaled on the same shaft, the onewheel pro vided with a pin projecting radially from its circumferenceand the other provided with a series of ratchet-teeth, of a carrier-hookhung between the two wheels to engage the said ratchet teeth, andprovided with a pin on one side crossing the path of the said radialpin, a shank for the said hook extending from the wheel in a tangentdirection, a free bearing in the frame for said'shank, and a springacting against the end of the hook to return it, substantially as shownand described.

THOMAS w. MAXEY.

Witnesses:

W. H. SoHRoEDER, W. F. GORDON.

